acl_copy_ext - copy an ACL from internal to external representation
Linux Access Control Lists library (libacl, -lacl).
acl_copy_ext(void *buf_p, acl_t acl, ssize_t size);
The acl_copy_ext() function copies the ACL pointed to by acl from system-
managed space to the user managed space pointed to by buf_p. The size
parameter represents the size in bytes of the buffer pointed to by buf_p.
The format of the ACL placed in the buffer pointed to by buf_p is a
contiguous, persistent data item, the format of which is unspecified. It
is the responsibility of the invoker to allocate an area large enough to
hold the copied ACL. The size of the exportable, contiguous, persistent
form of the ACL may be obtained by invoking the acl_size() function.
Any ACL entry descriptors that refer to an entry in the ACL referenced by
acl continue to refer to those entries. Any existing ACL pointers that
refer to the ACL referenced by acl continue to refer to the ACL.
Upon success, this function returns the number of bytes placed in the
buffer pointed to by buf_p. On error, a value of (ssize_t)-1 is returned
and errno is set appropriately.
If any of the following conditions occur, the acl_copy_ext() function
returns a value of (ssize_t)-1 and sets errno to the corresponding value:
[EINVAL] The size parameter is zero or negative.
The argument acl is not a valid pointer to an ACL.
The ACL referenced by acl contains one or more
improperly formed ACL entries, or for some other
reason cannot be translated into the external form of
[ERANGE] The size parameter is greater than zero but smaller
than the length of the contiguous, persistent form of
IEEE Std 1003.1e draft 17 (“POSIX.1e”, abandoned)
acl_copy_int(3), acl_size(3), acl(5)
Derived from the FreeBSD manual pages written by Robert N M Watson
〈rwatson@FreeBSD.org〉, and adapted for Linux by Andreas Gruenbacher